Here's the proper way to delete the Windows.old and $Windows.BT folders: 1  Click Start and type in disk cleanup (no quotes). Wait for the Disk Cleanup utility to show up in the Start menu and click it. 2  A window will appear asking you which hard drive you want to clean up. Choose the C drive (which is default) and click OK.
The A-and B-type HCs are very similar in appearance in the rabbit retina too. Other species may have more than two types of horizontal cell and often these other types are concerned with color coding (see chapter on Horizontal cells by Perlman et al., webvision).
Bottom, The chronological order of generation of mammalian retinal cell types. Retinal ganglion and horizontal cells are generated first, followed, in overlapping phases, by cone-photoreceptors, amacrine cells, rod-photoreceptors, bipolar cells and, finally, Muller glia cells. The numbers relate to embryonic and postnatal days of murine development.